US3598453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grade-compensated accelerometer in an antiskid system
Assignee: ZF Active Safety US Inc
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Filing: 1969-02-07
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Granted: 1971-08-10
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Expires: 1989-02-07
Abstract
Abstract An antiskid system in which an output signal X from a linear accelerometer is fed to a memory circuit. The output XI from the memory circuit will follow the input in the absence of a brake application signal Z. Upon occurrences of signal Z the memory circuit will hold the magnitude of signal XI at the magnitude of signal X before braking until signal Z is removed. Signals XI and X are applied to a difference circuit which produces an output signal Y which is X-XI. Signal Y controls a skid control circuit. In this manner accelerometer errors in output as a result of grade variations are minimized.
Inventors
- 👤 Hugh E Riordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:31
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/176; B60T8/1761; B60T8/17613; Y; Y10; Y10T; Y10T137/00; Y10T137/0971; Y10T137/0989
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
A grade-compensated accelerometer for a vehicle having a brake system actuable to decelerate the vehicle comprising: an accelerometer for providing a first output signal indicative of the acceleration of the vehicle, memory means responsive to said first output signal for providing a second output signal having a magnitude determined by the magnitude of said first output signal, said memory means being responsive to application of the brake system of the vehicle for providing said second output signal of a magnitude indicative of the magnitude of said first output signal prior to application of the brake system, output circuit means responsive to said first and second output signals for providing a third output signal having a magnitude determined by the magnitudes of said first and second output signals.
Claim 2
Dependent Claim
127 words
A grade-compensated accelerometer for a vehicle having a brake system actuable to decelerate the vehicle comprising: an accelerometer for providing a first output signal indicative of the acceleration of the vehicle, memory means responsive to said first output signal for providing a second output signal having a magnitude determined by the magnitude of said first output signal, said memory means being responsive to application of the brake system of the vehicle for providing said second output signal of a magnitude indicative of the magnitude of said first output signal prior to application of the brake system, output circuit means responsive to said first and second output signals for providing a third output signal having a magnitude determined by the magnitudes of said first and second output signals.
Claim 3
Dependent Claim
28 words
The device of claim 1 with said output circuit means providing said third output signal as a function of the difference between said first and second output signals.
Claim 4
Dependent Claim
50 words
In the device of claim 2 for use with a vehicle having a brake light switch, Said memory means responsive to actuation of the brake light switch to provide said second signal as a function of the magnitude of said first output signal prior to application of the brake system.
Claim 5
Dependent Claim
40 words
The device of claim 2 with said memory means storing the magnitude of said first signal in response to application of the brake system and providing said second signal to have a magnitude as a function of said stored magnitude.
Claim 6
Dependent Claim
44 words
In combination with the device of claim 1 skid control system means responsive to said third output signal for controlling the brake system of the vehicle in response to the occurrence of a skid condition determined as a function of said third output signal.
References Cited (Backward Citations)
US2942864A
Cited
US3494671A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |